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Google image search worthless ?

Can I have a question about google image search please ?
When you research keyword by google keyword tool, market samurai...etc...
The volume search is only web search or it's web search and image search together ?

Ex: Exactly local monthly search for "Iphone 5" is 3,350,000
So how much volume search by web search and image search? Some people want to get detail about new iphone , another want to see image..

I read on many forums that visit from Image search is worthless , they just need images and nothing else. They download image from google image search and they leave , your visit increase but bounce rate increase also. Can you sale something from that visit ?

I am targeting a keyword that exact local search is 5000
But I am not sure 5000 search by web search or by image search(worthless). I think the 40-50% traffic come form this keyword by google image search.
Did I have wrong keyword research ? Because I want to make money with Adsense or Amazon...